Temperature sensitivity of long-period gratings inscribed with a CO2 laser in optical fiber with graded-index cladding

2006 ◽  
Vol 119 (2) ◽  
pp. 642-650 ◽  
Author(s):  
Miroslav Chomát ◽  
Jiří Čtyroký ◽  
Daniela Berková ◽  
Vlastimil Matějec ◽  
Jiří Kaňka ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Co2 Laser ◽  
Temperature Sensitivity ◽  
Graded Index ◽  
Long Period ◽  
Long Period Gratings

scholarly journals Sensitivity Characterization of Cascaded Long-Period Gratings Operating near the Phase-Matching Turning Point

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 5978
Author(s):  
Wei Zhou ◽  
Yanli Ran ◽  
Zhijun Yan ◽  
Qizhen Sun ◽  
Chen Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Temperature Sensitivity ◽  
Turning Point ◽  
Phase Matching ◽  
Long Period ◽  
Long Period Gratings ◽  
High Measurement ◽  
Surrounding Refractive Index ◽  
Wavelength Resolution ◽  
Quality Factor Q

We characterized a cascaded long-period gratings (LPGs)-based sensor that was operating at the phase-matching turning point (PMTP). The cascaded LPGs constructed an in-fiber Mach–Zehnder interferometer (MZI), which exhibited a series of high-quality-factor (Q) narrow-bandwidth resonance peaks. As the LPG operated at the PMTP, the proposed sensor showed an ultrahigh refractive index (RI) and temperature sensitivity, and high measurement precision. In this study, we took an in-depth look at the effects of grating separation on Q-factor and sensitivity. The results showed that the sensitivity to the surrounding refractive index (SRI) reached 4741.5 nm/RIU at 1.4255 and 2138 nm/RIU, over the range of 1.335–1.373. In addition, the temperature sensitivity was around 4.84 nm/°C. With a 0.02 nm wavelength resolution, the RI and temperature sensing limits were 9.3 × 10−6 RIU and 5.5 × 10−3 °C.

scholarly journals Soil moisture content measurement using optical fiber long period gratings

2017 ◽  
Author(s):  
J. S. Hallett ◽  
M. Partridge ◽  
S. W. James ◽  
D. Tiwari ◽  
T. Farewell ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Optical Fiber ◽  
Soil Moisture Content ◽  
Long Period ◽  
Content Measurement ◽  
Long Period Gratings ◽  
Moisture Content Measurement

Mode Scrambler Using CO2-laser Inscribed Long-period Gratings

2018 ◽  
Author(s):  
Yunhe Zhao ◽  
Haoshuo Chen ◽  
Nicolas K. Fontaine ◽  
Jiaxiong Li ◽  
Roland Ryf ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Long Period ◽  
Long Period Gratings

Recording of long-period gratings in special single-mode fibers by a CO2 laser

2006 ◽  
Vol 26 (2-3) ◽  
pp. 448-452
Author(s):  
Petr Císařovský ◽  
Jiří Dunovský ◽  
Ladislav Kolařík ◽  
Filip Todorov ◽  
Ivan Kašík ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Single Mode ◽  
Long Period ◽  
Long Period Gratings

Responses of a long-period grating fabricated in a graded-index optical fiber to temperature and refractive-index changes

2006 ◽  
Vol 26 (2-3) ◽  
pp. 457-461 ◽  
Author(s):  
M. Chomát ◽  
D. Berková ◽  
V. Matějec ◽  
I. Kašík ◽  
J. Kaňka ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Long Period Grating ◽  
Graded Index ◽  
Long Period ◽  
Index Changes
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